WASHINGTON – Confirmed Cyclospora infections were approaching 16,000 across 47 states as federal and state health officials investigated a large outbreak linked to processed iceberg lettuce and other clusters that have not all been tied to a single source.
The national total reported by USA Today includes domestically acquired illnesses recorded during the 2026 surveillance season. Public-health officials cautioned that it is broader than the outbreak associated with Taylor Farms de Mexico lettuce. As of an Aug. 20 update, the Food and Drug Administration said the lettuce-linked outbreak accounted for 10,930 illnesses, 454 hospitalizations and two deaths in 17 states.
The FDA said epidemiologic and traceback evidence linked that outbreak to processed iceberg lettuce supplied by Taylor Farms de Mexico. People reported eating salads from restaurants, cafeterias and other food-service settings before becoming ill. The agency said recalled lettuce should no longer be available for sale because of its limited shelf life, but the investigation remained open.
Cyclospora is a microscopic parasite that infects the small intestine. The most common symptom is prolonged, watery diarrhea. Other symptoms may include appetite loss, weight loss, cramping, bloating, nausea, fatigue, body aches and a low fever. Symptoms often begin about a week after exposure, although the incubation period can range from roughly two days to two weeks or longer.
Untreated illness can last for weeks and may improve and return. The Centers for Disease Control and Prevention says doctors may need to specifically request Cyclospora testing because many routine stool examinations do not automatically include it. Several specimens collected on different days may be needed because the parasite can be shed intermittently.
The recommended treatment for most patients is the antibiotic combination trimethoprim-sulfamethoxazole. People with persistent diarrhea, signs of dehydration or other concerning symptoms should contact a health care professional. Older adults, young children and people with weakened immune systems may face greater complications from a prolonged diarrheal illness.
The national count does not mean every patient became sick from lettuce. Federal officials investigate clusters separately and use interviews, purchase records and supply-chain tracing to identify possible common foods. Cyclospora cases typically rise during spring and summer, and an exposure often cannot be identified for every patient.
Consumers can reduce risk by washing hands and kitchen surfaces and rinsing produce under running water, but the CDC notes that routine washing or chemical sanitizing may not completely remove Cyclospora. Restaurants and food-service operators should follow supplier recall notices and maintain records that allow rapid traceback.
Source: USA Today, published Aug. 20, 2026. Additional verification: U.S. Food and Drug Administration and Centers for Disease Control and Prevention guidance.
